Ultimately, this is a lecture that will teach you a lot about the spectrum that developers need to know. It seems to cover everything beyond writing, building, and running code. Recently, I studied Linux and installed Gitlab for management, and I experienced problems that I encountered naturally while using Docker in the process of building CI/CD. I hope you don't miss this lecture because it sufficiently explains the things I experienced. There are many Docker lectures, but they end after running them, and there are many CI/CD lectures, but they end after installing and running them. These days, there are so many books and lectures that are popular contents such as GitHub build/deployment execution... ... After about a month of many attempts, learning, trial and error, and concerns, I am in the process of spending a lot of time on automation with the thought that even a single developer, not an organization, should have a 'system'. This lecture was a great help in that process. Recently, from domain settings to installing and setting up Gitlab, Gitlab Runner, Prometheus, Grafana, etc., I had to install and specify the path for SSL communication, verify and issue the certificate, and renew it here and there... However, this is because the domain certificate is valid for 3 months and the SSL certificate is valid for up to 1 year, so there is no problem using it right away, but after that, it will expire and there will be problems, or if it is actually in operation, there will be a downtime accident, or the key will be lost and have to be set up again. I have to study and learn more about certificates, and if possible, I am thinking of registering a shell program for automatic renewal as a cron~~ However, if there is a supplementary lecture on certificate renewal and automation, it would be good. ^^ ㅎㅎ It is more unstable than a bank certificate.. If I had to come here without knowing what to study on my own, it would have taken several months, but thanks to the excellent lecture, I feel confident that I can finish it in a few days. I plan to spend the remaining weekend practicing applying it to an actual server. The story behind development that developers must know... Everyone, this is a great lecture.~~~~ Thank you. ^^